1. Solving Stoichiometry Problems
Objectives:
1. Name four major categories of stoichiometry problems.
2. Explain how to solve each type of stoichiometry problems.

2. Mole-Mole Problems 0.87 mol Al 6 HCl = 2.6 mol HCl
Problem: How many moles of HCl are needed to react with 0.87 moles of Al?
Step 1: Balance The Equation
Step 2: Set up the equation identifying the given and the want
0.87 mol Al HCl Al
Step 3: Calculate the new moles using the ratios of coefficients from the balanced equation
0.87 mol Al HCl = 2.6 mol HCl
2 Al

3. Mass-Mass Problems (MassgMol; MolgMol; MolgMass)
Problem: How many grams of Al can be created decomposing 9.8g of Al2O3?
Step 1: Balance The Equation
Step 2: Calculate the moles of the given (mol/g)
Step 3: Calculate the moles of the new substance using the molar ratios
Step 4: Calculate the new mass using the new moles

4. Solutions to Common Problems
particles
mass
volume
Mole given
New mole using ratios
/ 6.02x1023
/ molar mass
x 6.02x1023
/ 22.4L
x molar mass
x 22.4L
Mole to mole using the ratio of coefficients